Motorola 880 Service Manual page 147

DUAL BAND 8900 RF BLOCK DIAGRAM
Loss from
ANT ANT
Antenna and EXT ANT
GSM DCS
GSM -1.7dB
DCS -2.1dB
A2
A1
from GSM /DCS Matrix
GSM_RX275
f
DCS_RX275
GSM ( CH 62 )
947,4 MHz
B
C
GSM -0,6dB
Q410
FL400
DCS -1,0dB
7
GSM -2,2dB
5 GSM 12,8dB
U102
DCS 9,3dB
DCS -2,2dB
4 B
C
2
Q430
V2
V1 FL401
h
EXT ANT
6 3
SW_RF
1842,8 MHz
from and to
2
3 GSM ( CH 62)
DCS ( CH 700 )
J400 Pin16
V1 V2
732,4 MHz
U401 U104
SWITCH
CONTROL
8
1 4 5 6
a d c e
GSM ( CH 62 )
902,4 MHz
DCS ( CH 700 )
1747,8 MHz
GSM 8,7dB
GSM 21dB
GSM -5dB
DCS 17dB DCS 12dB
PA
CR330 DCS -5dB
11 C
7 B
R333
U300
Q330
Attenuator
C
Q303-
Q305
-10V
PAC_EN
EXC
7
U340 / PAC
RF_IN
DET
2
TX_EN
1, 3
SAT.
4, 14
8
10 12 11
RF LAYER - ORDERABLE SPARES
Part Part Part Part
Designator Description Number Designator
A1, A2 Antenna Conn. 3909014B03 U520
CR202 Main VCO Varactor 4809641F02 VR352
CR203 Main VCO Pin Diode 4809948D05 VR353
CR220 RX Local Osc. Varactor 4809641F02 SH1
CR221 Ref. Osc. Varactor 4809641F04 SH2
CR223 TX Local Osc. Pin Diode 4809948D05 SH3
CR261 TX Local Osc. Varactor 4809641F02 SH4
CR330 TX Isolation Diode 4809948D05 SH5
Q221 / Q222 Supply Transistor 4809579E18 SH6
Q330 Tx Predriver (Exciter) 4809527E19 SH7
Q410 GSM Receive Power Ampl. 4809527E20 SH8
Q430 DCS Receive Power Ampl. 4809605E06 SH9
Q460 RX Mixer Amplifier 4809527E20 SH10
Q480 IF Isolation Amplifier 4809940E01
Q604 Transistor Thermistor Line 4813823A07
U102 Antenna Switch 5109572E04
U104 Antenna Switch Control 5109923D14
U220 GIFSYN IC 5109632D92
U300 PA 5109908K18
U340 PAC IC 5109632D08
U370 TIC IC 5109632D94 Y201
CR 220
RX
LOCAL
MIX_275
OSCILLATOR
Osc.
discrete
430 MHz
circuty
GSM 9,8dB
Q460 DCS 9,8dB GSM 10dB
FL461
215 MHz
DCS 10dB
C
B
C
GSM -2,2dB
Q480
B C
FL460
DCS -2,2dB
C
E
GSM -4,5dB
SW_VCC
FL462 DCS -4,5dB
b
C
MDM_ANA_VCC
Q221
DCS ( CH 700 )
to SMOCand 13 MHZ Clock
j k
E
1627,8 MHz B+
E
a
RX275 Q222
C
MAIN VCO
SF_VCC
GSM ( CH 62 ) DCS ( CH 700 )
C C
720 MHz 813,9 MHz
C212
DCS
C
Q201
Q200
Q202
C B
B
C213
LOOP FILTER
C214
GSM 1,5V - 2,5V
CR203 CR 202
DCS 1,5V - 3,0V
*GSM_DCS
GSM / DCS g
TX VCO
DCS 1,8 - 2,1V
R475
14 1
7
U370 / TIC
DM_CS
C
VR352, 353
B PHASE
8 CHARGE 9,10
Q350
R475
DET.
Capacity Switch PUMP
4
CR350 / 351 2 ,12
R275
VR352
GSM 170 MHz
DCS 120 MHz
TX_GSM_*DCS
Osc.
discrete
circuty
TX
LOCAL
OSCILLATOR
CR223 CR 261
GSM 340 MHz
GSM_*DCS
DCS 240 MHz
C271
GSM ----- 1V
DCS 1,7 - 2V
TEST COMMANDS
Part Part
# press 2 sec. Enter Manual Test Mode with Test Card
Description Number
01 #
Modem IC 5199281C03
07 #
TX VCO Varactor 4809877C07 08 #
09 #
TX VCO Varactor 4809877C06
10 #
Shield Low Noise Ampl. 2609315M01
11 xxxx # Program Main Local Osc. to Channel
Shield RX Mixer 2609306L01
12 xx # Set Tx Power level to fixed valure
Shield Saw Filter 2609282J01 19 # Display SW Version Number of Call Processor
20 # Display SW Version Number of Modem
Shield Main VCO 2609281J01
22 # Display SW Version Number of Speech Coder
Shield GIFSYN 2609446K01
25 #
Shield TIC IC 2609307L01
26xxxx #
Shield Ant. Switch 2609279J01
31x # Initiate Pseudo-Random Sequence with Midamble
33xxxx #
Shied Tx VCO 2609462R01
36 #
Shield PA 2609280J01
37 #
Shiel Front End 2609315M01
45xxxx #
46 # Display Current Valure od AFC DAC
47x #
58 / xxxxxx #
59 / xxx #
60 #
7100 #
Ref Clock Varactor 4809612J19
GSM / DCS 1,2V
43
41
PLL
42
46
RXI
i 15 RXI
31 ATT.
47 IQ REF
DEMODULATION 16 IQ_REF
25dB
48 RXQ
14 RXQ
33
12
16 VRef
B
13
17
51 RF_START
U220
18
MODEM
B
19
GIFSYN
U520
to BIC pin17
21
59
CLK_OUT
26
23 57
AFC
PLL Y201
CR221
52 RF_SPI
SPI SERIAL
78 RF_SPI
DATA BUS
53
RF_SCK
INTERFACE 77 RF_SCK
R475V
11, 22, 44
TXQ_P
61
21 TXQ_P
TXQ_M
62
22 TXQ_M
TXI_P
MODULATION 63
TXI_P
4 24
64 TXI_M
23 TXI_M
6
PLL
7
10
DET_SW
AOC_DRIVE
SAT_DET
RECEIVE DEBUG - GSM MODE
Before actually removing any cans it may be worth checking the RX275_____, MDM_ANA_VCC______, RX_EN______, -10V ______,
f g
Exit Manual Test Mode
GSM_RX275______ and if the *GSM_DCS______ is high to switch the output of Q412 Pin6 and Q205 Pin4 to high.
Mute Rx Audio Path
TEST MODE: Type in Key commands: 110062#, 262000#, 25013#, 241#. Test for a set level eg. (-30dB' s) at point ______to compensate cable losses.
Unmute Rx Audio Path
The only real short-cut we can take is by probing the 215MHz test point_______ (pin 31of GIF).
Mute Tx Audio Path
- If the 215 is OK then we can assume problem lies around GIF, either 430MHz Local Oscillator or in generation of RXI and RXQ. The can
Unmute Tx Audio Path
SH05 should then be removed. Check that IQ Ref from the SMOC is around 1.38Vdc and then the RXI and Q outputs from the GIF to check w hich is
faulty.
- If the 215Mhz is low probe the R.F inputs to the Mixer to see which RF path (RF INPUT or MAIN VCO) the fault lies on.
- If Main VCO is low, the main suspicions are with the main VCO, or the VCO filter (FL461/462) and the SH01 and SH02 can should be removed.
. If the input to the filter is low, then there is some discretes under the VCO can. Check
- If RF INPUT, and the MAIN VCO OK, the main suspicions are with the 2 input filters FL400 and FL401 and the can SH10 should be removed.
If the signal is low at the input to these, it could be losses caused by the Antenna Switch U102.
- If 947.4 and 794.4 RF values are fine but 215MHz into GIF is
Set Continuous AGC
and IF Isolation AMP (Q480) is located under here.
Set Continuous AFC
FREQUENCIES GSM / DCS
Synchronize to BCH Carrier
Initiate Acoustic Loopback
Stop Test GSM / CHANNEL Tx Rx
Serving Cell Power Level
1-Low 890.2 935.2
Set Audio Volume
62-Middle 902.4 947.4
Display / Modify Security Code
124-High 914.8 959.8
Display / Modify Lock Code
Display IMEI
DCS / CHANNEL Tx Rx
Display Error Code
512-Low 1710 1805
700-Middle 1747,8 1842,8
885-High 1785 1880
Motorola Confidential Proprietary
RF BOARD SIGNALS
Tx SIGNALS - 110062#, 1215#, 310#
Frequency 217Hz - 1ms/cm
3Vpp
SAT_DET
RESET
73
Power Step:
04-11 - 50mVpp
DET_SW
12-15 - 900mVpp
TX_KEY
69
from U701, 6
TX_KEY
2,75Vpp
DM_CS Power Step:
9 04 - 520mVpp
AOC
15 - 280mVpp
RX_ACQ
17
TX_EN 3Vpp
DM_CS
2,8Vpp
TXI 2.1Vpp
TXQ
2.1Vpp
13_DCLK_B
42
from U703, 37
Modem Callprocessor Interface
2,8Vpp
MDM_RD
500us/cm
SPI_MI
6
2,8Vpp
MDM_WR
SPI_RFCS
500us/cm
79
SPI_SCK
8
Rx SIGNALS - In Standby Mode
SPI_MO
4
2,8Vpp
RX_ACQ
500us/cm
MDM_RD
75
2,8Vpp
RF_START
20us/cm
MDM_WR
76
Rx SIGNALS - 110062#, 262000#, 25013#, 241#
2, 5,10,18
Frequency 217Hz - 1ms/cm
L 275V
25, 41, 45
53, 64, 70
1.8Vpp
RX275
RXI
500us/cm
34
RXQ 1.8Vpp
500us/cm
1.38Vrms
IQ_REF
500us/cm
TRANSMIT DEBUG
a c
b e
Put the phone into test mode and key in the commands: 110062#, 1200#, 310#
Firstly if no Transmiter output we should check the modulation output at U220 Pin 4 and the Main VCO
j k
at point _________to establish which of the signals are missing or if both the signals are missing.
h
- If the modulation output is missing and Main VCO is fine
i
the CR261 and the tuning voltage from U220 Pin10. Check if Q222 and Q221 have both 2.7V.
If still no problems found, measure from CPU
- - If Main VCO is missing but modulation is fine
Main VCO tuning voltage U220 Pin23.
- If bothMain VCO and modulation are missing
check from CPU DM_CS
SF_VCC U220 Pin21 and Main VCO tuning voltage U220 Pin23.
- If TX is generated but is low
- If TX looks OK but fails in wingate
low_____ then we must also remove can SH03 and SH5. The SAW filter (FL480)
and the J600 connector itself.
MAIN VCO Rx I.F Rx IF LO Tx I.F Tx IF LO
720.2 215 430 170 340
732.4 215 430 170 340
744.8 215 430 170 340
MAIN VCO Rx I.F Rx IF LO Tx I.F Tx IF LO
1590 215 430 120 240
1627,8 215 430 120 240
1665 215 430 120 240
Signal from PAC to SMOC.
When PA is at or near saturation signal is low, telling SMOC to reduce AOC drive
When the PA is not near saturation this is high, telling SMOC to increase AOC drive.
Signal from the SMOC to the PAC
When this signal is low, the internal gain in the PAC is unity.
When this signal is high, the internal gain in the PAC is 1.
From uP to PAC.
This is a timing signal to the PAC to provide the current path for the initial loop precharge
Signal from SMOC to PAC.
This is a linear control voltage for ramp up and ramp down of the PA output level.
This controls the voltage on the exciter control output (EXC) from the PAC.
Signal from uP but inverted via Q500 and used to time:-
1. GIF SYN 2. TIC 3. Tx VCO 4. PAC 5. RF Switch
Enables Tx Path when high
Signal from uP inverted via Q504.
Enables TIC, PA and TX VCO.
When high, this enables Tx path.
From SMOC IC to GIF SYN
This signal is the in-phase input to the I-Q Modulator of the GIF SYN.
From SMOC IC to GIF SYN
This signal is the quadrature input to the I-Q Modulator of the GIF SYN.
From uP to SMOC.
This signal indicates when the uP is reading data from the SMOC. High when enabled.
From uP to SMOC.
This signal indicates when the uP is writing data to the SMOC. High when enabled.
From uP to SMOC
This is an interrupt from the uP to the SMOC. When high this indicates to the SMOC the
beginning of the receive burst.
From uP to GIF SYN
Signal to drive the GIFSYN IC. This is a pulsed signal which controls the sending of SPI data
to the GIFSYN for all RF functions.
From GIF Syn to SMOC IC.
This is a baseband analogue signal to A/D convertors of SMOC
From GIF Syn to SMOC IC.
This is a baseband analogue signal to A/D convertors of SMOC
From SMOC to GIF Syn.
This is a DC level from SMOC for the RXI and Q signals to ride on.
then remove SH05 and check in the TX Local Oscillator
DM_CS at Modem Pin9. If ok replace U220.
remove SH05 and check discretes, SF_VCC U220 Pin21 and
then check the collectors of Q221 and Q222 for 2.7V. If ok, then
at Modem Pin9. Possible GIF SYN or Modem problem.
then we look for problems under SH08 and SH09 and follow path through to antenna.
check at the T/R switching circuitry (U102/U104) switching RF to J600 Pin2
REVISIONS
Europe Middle East & Africa Customer Services 30.04.98
LEVEL 3 COLOUR DIAGRAMS Rev. 1.0
Dual band 8900
Colin Jack, Michael Hansen, Billy Jenkins Page 2 of 2